-12(9+r)=-264

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Solution for -12(9+r)=-264 equation: 


Simplifying
-12(9 + r) = -264
(9 * -12 + r * -12) = -264
(-108 + -12r) = -264

Solving
-108 + -12r = -264

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '108' to each side of the equation.
-108 + 108 + -12r = -264 + 108

Combine like terms: -108 + 108 = 0
0 + -12r = -264 + 108
-12r = -264 + 108

Combine like terms: -264 + 108 = -156
-12r = -156

Divide each side by '-12'.
r = 13

Simplifying
r = 13

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